Toggle press



EM. 251, 19:28. 1,696fi22 A. A. BYERLEI N TOGGLE PRESS Filed April s,1926 "7 sheets-sheet i mung;

A. A. BYERLEIN TOGGLE PRESS Filed April s, 1926 '7 Sheets-Sheet 2 A. A.BYERLEIN TOGGLE PRESS Filed April :5, 1926 7 Sheets-Sheet 5 55 5 57 & 6W l H :17 #7 g J A. A. BYERL lN TOGGLE PRESS Filed April 5, 1926 '7Sheets-Sheet 4 Yld Dec. 25, 1928. 1,696,622 A. A. BYERLEIN TOGGLE PRESSFiled April 5, 1925 'r SneetsTSheet 6 Patente Dec; 25 1928 warren S T-ATE ARTHUR A. BYEBLEI'N, or nn'rnorr, m rcnraan.

TOGGLE PRESS.

Application filed April 3,1926. Serial No. 99,585.

The present invention relates to drawing presses.

One of the principal objects of the present invention is to provideactuating mechamsm' for the blank holder of a press, which isconstructed and arranged to lessen the strain upon the parts, to obtainan even pressure correspondin of the blank holder upon the work, and tosecure other advantages hereinafter pointed out. i

Another object of the invention is to provide a drawin press havingprovisionsfor actuating the blank holder from a single slide actuatingmember movable in a direction transverse to the direction of movement ofthe blank holder.

' Other objects and advantages will be apparent from the followingdescription taken in connection with the accompanying drawing in whichFig: 1 is a front elevationof a drawing press embodying the presentinvention;

Fig. 2 is a side elevation thereof;

Fig. 3 is a rear elevation of the press;

Fig. 4 is a central vertical section taken on the line 4 4 of Fig. 3,showing the parts in raised position; j Fig. 5 is a vertical sectionsimilar to Fig. 4 showing the parts in lowered position;

Fig. 6 is a part section on the line 66 of Fig.5;

Fig. 7 is a part section on the line 77 of Fig.--5, some of the partsbeing shown in Ian; Fig. 8 is a section on the line 8-8 of Fi 5' Figit)is a section on the line 99 of Fig. 5; i d

Figs. 10 and 11 are diagrammatic views of certain linkages;

Fig. 12 is an enlarged section of a detail taken on the line 1212 of.Fig. 7

Fig. 13 is a fragmentary sectional View, to Fig. 5, showing a modifiedform of mechanism and taken on the line 1313 of Fig. 14;

Fig. 14 is a fragmentary sectional view taken on the line 14-14 of Fig.13; and

Fig. 15 is a detail sectional view on the line 1515 of Fig. 14.

Referring to the embodiment of the invention illustrated in Figs. 1 to12, 2O designates the frame of the press which comprises a bed 21,spaced apart uprights or side frames 22 which are adapted to carry theactuating mechanism and to guide the blank holder and plunger forvertical reciprocatory movement and an arch member 23. A blank holder 25is guided upon guides 26 upon the side frames 22 of the-press, and

.a plunger 27 is guided within the blank holder 25. A rotary actuatingshaft 29 is journaleddn the side frame 22 above the plunger 27 and isprovided with cranks 30 which are connected with the plunger 27 plunger27 is given a reciprocatory movement within the blank holder 25 uponrotation of the actuating shaft 29.

Means for reciprocating the blank holder 25 in its guides 26 comprises atoggle mecharock levers 42 and the links 43 constitute toggles for.reciprocating the blank holder,

through links or pitmans 31 whereby the '80 -thereof. The rock shaftstogether with the it being apparent that rotation of the rock shafts 40and 41 in opposite directions re sults in either raising or loweringthe-b ank holder 25 and since all the corresponding parts movesimultaneously and through equal distances, the blank holder is raisedor lowered without tilting or binding and an even pressure is-obtainedupon the work when the blank holder is in its lowered position.

Mechanism is provided for actuating the I rock shafts 40 and 41 and theblank holder 25 from the plunger-actuating crank shaft 29, thearrangement being such as to cause a dwell in the movement of the blankholder when it is in engagement with the work; Such actuating mechanismincludes as its principal element a single slide actuatin member 50which is connected with the mo er shafts 40 and 41, to actuate the same,and

which is itself actuated from the plungeractuating shaft 29. The slidemember 50 is supported between the rocker shafts 40 and 41 within aslide housing 51 which guides the slide member for reciprocatory movement along an obliquely disposed line extending from front to rear ofthe press, the

line of movement passing above. the front rock shaft 40 and below therearropk Shaft.

41. This arrangement is best illustrated in Figs. 4' and 5. The slidehousing 51 is an elongated tubular member preferably of rectangularcross section, as shown in Fig. 8, and is provided with a flange 52 bywhich it may be rigidly secured to the arch member 23 of the press,which arch member is cast with an obliquely disposed opening 53 in themid-plane of the press to receive the housing 51 therein.

Referring particularly to Figs. ,4 to 9, the plunger-actuating shaft 29is provided with a crank 55, also preferably in the mid-plane of thepress, which crank is connected by a connecting rod 56 with rockingsector shaped lever 57 pivotally mounted on pin 58 which isiimmovablyfixed in a part 59 connected with the arch 23 of the frame. Rockinglever 57 is connected by another link 60 to a second rocking lever 61which is mounted on pin 62 which, like pin 58, is immovably fixed in thepart 59 carried by the arch 23. The rocking lever 61 is pivotallyconnected with the slide member 50 by two pairs of links 65 and 66, thelinks 65 being mounted on the outer ends of pin 67 of rocking lever 61,and the links 66 being mounted upon the outer ends of the pin 68 carriedby the rear end of the slide 50. The links and 66 areconnected togetherby a link pin 70, being mounted on the outer ends of this pin, as bestshown in Fig. 7.

The middle part of the link pin 70 be tween the links 66 is of enlargeddiameter and is provided with a pair of parallel flat surfaces onopposite sides thereof. This enlarged portion of the link pin 70 issurrounded by a hollow pin or bushing 76 the internal diameter of whichis greater than the diameter of the link pin 7 O, which bushing is alsoprovided with a pair of parallel flat surfaces 77 which are adapted tocooperate with the fiat surfaces 75 of the link pin 70, The bushinhave"a close sliding t with the surfaces of the link pin 70, and mayslide a short distancerelatively to the pin 70 in either directionparallel with the surface 75 and at right angles to the axis of the pin70. The bushing 76 is carried in the lower end of the forked rock arm 78extending from rock lever 41 and is held against rotation in the rockarm 78 by keys 79, or other suitable means. The outer surface of thebushing 76 between the forks of the arms 78 is cylindrical andconstitutes a bearing for a link 81 pivotally mounted thereon, the otherend of said link being pivotally mounted upon the link pinv 68 which iscarried by the slide 50. I

The rear toggle rock shaft 41 is thus operativel connected with anddriven from the sli e member 50 through the link 81 pivotally mounted atone end upon the pin 68 carried by the slide member 50, and

76 is constructed to.

the entire load for actuating the slide 50 from the plunger-actuatingshaft 29 is under greater stress than the linkage connecting the slide50 with the rear rock shaft 41, and it is to be expected therefore thatthe running clearance between the links 66 and their cooperatinglinkpins 68, 70 is different than the running clearance between the link 81and its cooperating link pin 68 and bushing 76. This naturally resultsin relative movement between the axis of the link pin 70 which is indriving connection with the links 65 and 66, and the axis of thebushing76 which is in driving connection with the link 81 and rock arm 78 ofrock shaft 41.

Such relative movement of the pin 70 and the bushing 76 is provided forby the loose sliding connection between these arts. This may be perhapsbest understood upon reference to Figs. 10 and 11 which illustratediagrammatically the linkages above referred to. In Fig. 10, whichcorresponds to Fig. 4, the linkages are shown in the position'forholding the plunger and the blank holder raised, and in Fig. 11, whichcorresponds to Fig. 5, the linkages are shown in the positionscorresponding with the low ered positions of the plunger and theblanklink pin 70 with it, so that, in the construction here illustrated,the sliding movement between the pin 70 and the rock bushing 7 6 isalways in a direction normal to a line connecting the axes of pin 70 androck shaft 41. 'It isevident from Figs. 10 and 11 that the link pin 70is free to slide in the bushing 76 and to take a position thereindependent upon the I running clearances between the parts 68, 66, and70, which clearances may vary from time to time with the varyingstresses upon these parts and with wear of these parts. In Fig. 11 whichillustrates the position of the linkages when the plunger and blankholder are in lowered position, there is shown by dotted lines aposition of the links 65 and 66 and of the link pin 70 whlch may resultfrom a change in running clearances as a consequence of the link pins 67and 68 approaching one another. It will be observed that. the link pin70 has slid in the bushing 76, but the sliding of pin 70 imposes noadditional stress u on the linkage 81, 7 8 by which the rock sha t 41 isactuated from the slide 50, and hence the running clearance of thelinkage 81; 7 8 is not modified or altered in any way by a different ora changing clearance of the linkage 65, 66. While the bushing 76 isherein shown as rigidwith rockarm 78 and constructed to guide the'pin 70for sliding movement at right angles to the axis of the rock arm, itshould be understood that the construction and arrangement of theseparts is subject to modification, and that I may secure the bushing 76to either member of the linkage cooperating therewith or changethedirection of slide of the pin 70 therein without departing from thespirit of the present inventionI The forward end of the slide member isconnected in actuating relationship with the front rock shaft 40 todrive the latter by mechanism which consists of a link pin 85 carried bythe slide member, a link 86 pivoted thereon, and pivotally connected atits other end with link pin 87 carried upon the outer end of the forkedrock arm 88 ex -tending from the front rock shaft 40.

The linkage between. the sliding member 50 and each of the rock shafts40 and 41 is such that the rock shafts are actuated through equalangular distances thereby effecting parallel raising and loweringmovement of the blank holder throughout its operation, and securing evenpressure of the blank holder upon the work. An important feature of thepresent invention is the arrangement of linkages by which the power ofthe plunger-actuating shaft 29 is transmitted direct "to the slidingmember 50, the rock shafts 40 and 41 being actuated from the slidingmember by linkages, the running clearances of which are not modified orin} fiuenced unequally by the running clearance of the main drivinglinkage.

In Figs. 13, 14 and 15 there is illustrated a modified form of linkagefordriving the sihgle slide actuatin -member from the plunger-actuatingshaft of the press. The

arrangement of the press frame, the rocker shafts, the plunger-actuatingshaft, the slide actuating-member,and the linkages, is generally thesame as in Figs. 1 to 12 and these parts have been indicated byreference characters corresponding, to the corresponding parts in Figs.1 to 12. The arch member of the press frame is shown at 123, theplungeractuating shaft at 129, the front and rear toggle rock shafts atand 141 respectively and the single slide actuating-member at 150. Therocker shaft 140 is operatively connected with the blank holder, notshown, by rock levers 142 and links 143, and the rocker shaft 141 issimilarlyconnected with the blank holder.

The single slide actuating-member is slidably mounted in a slide housing151 which extends through an obliquely disposed opening 153 in the archmember 123 and which is provided with a flange 152 by which it may berigidly secured to the arch member. The plunger-actuating shaft 129 isprovided with a crank 155 which is connected by a connecting rod 156with rocking sector shaped lever 157 pivotally mounted on pin 158, whichlever 157 is in turn connected through link 160 to rocking lever 161.Rocking lever 161 is mounted for rocking movement about pin 162. The rocing lever 161 is pivotally connected with the slide member 150 by links165 and 166.

The rocking lever 161 and the link 166 is hollow pins or bushings 176which are carried by the forked rock arms '17 8, said rock arms having apair of forks adapted to cooperate with and receive each of saidbushings 17 6 Each end of the link pin 170 is provided with a pair ofparallel flat surfaces 17 5 adapted to be received between cooperatingparallel fiat surfaces 177 upon the interior of the bushings 176. Asbefore, the bushings 176 are constructed'to have a close sliding fitwith the surfaces of the link pin 170 and may slide a short distancerelativelyto the pin 170 in, either direction parallel with the surface17 5 and at right angles to the axis of the pin 170. Since the pin 17 0is keyed to the link 166 with the flat surfaces parallel with thelongitudinal axis of link 166, it is apparent that the bushings 176 areconstrained to movement upon pin 175 in a direction parallel with thelongitudinal axis of the link 166. As best illustrated in Fig. 14, thelinks 181 are pivotally mounted upon the bushings 176 between the pairsof forks 178. The rear end of the slide actuating-member 150 is thusconnected with the rocker shaft 141 through links 181, bushings 176, andthe forked' -arms 178 mounted on rocker shaft 141, and because of thesliding connection between the bushings 176 and the pin 170 there is acertain independence of movement between the main linkage by which theslide actuating-member 150 is driven and the linkage by which the slideactuatingmember is connected with the rocker shaft 141, as will bereadily understood. r

lhe forward end of the slide member 150 is connected in actuatingrelationship with link pin 187 carried upon the upper end of Y the rockarm 188 extending from the front rock shaft 140.

It will be understood that the form of mechanism shown in Figs. 13 to 15operates in the same general manner as the form illustrated in Figs. 1to 12. a

While the forms of apparatus herein described constitute preferredembodiments of i the invention, it is to be understood that theinvention is not limited to these precise forms of apparatus, and thatchanges may ing be made therein without departing from the scope of theinvention which is defined in the appended claims.

' What is claimed is: I

L A drawing press comprising a frame, a plunger, and a blank holder, andmeans provided at the transverse center of the press for reciprocatingsaid blank holder with a dwell in its movement, said means comprising anactuating member guided to slide back and forth in a direction inclinedto the direction of movement of said blank holder, and a drivingconnection between said actuating member and said blank holder.

2. A drawing press comprising a frame, a plunger, and a blank holder,and means for reciprocating said blank holder with a dwell in itsmovement, said means comprisan actuating member above the blank holderguided to slide in a direction inclined fromfront' to rear of the press,and a driving connection between said actuating meinher and said blankholder.

3. A drawing.press comprising a frame, a plunger, and a blank holder, apair of spaced apart rock shafts for actuating said blank'holder, andmeans for actuating said rock shafts, said means comprising a slidemember guided to slide in a directioninclined obliquely to the rockshafts and equally spaced therefrom, and a driving connection betweensaid slide member and said rock "shafts.

4/11 drawing pres s comprising a frame, a

plunger, and a blank holder, apair of spaced apart rock shafts foractuating said blank 6O holder, and means for actuating said rockshafts, said means comprising a slide actuating-member disposed between.said rock shafts and guided to slide along a line passing over one ofsaid rock shafts and under theother rock shaft, and adriving connectionbetween said slide member and said rock. shafts.

. 5. A drawing press having a frame, a plunger, and a blank holder, arotary shaft actuating said plunger, and means for actuating said blankholder with a dwell in its movement, said means comprising a singleslide actuating-member mounted medially of tions, said drivingconnections beingconnected with the slide at points spacedapart in thedirection ofmotion of the slide.

6. A. drawing press having a frame, a plunger, and a blank holder, acrank-shaft for operating said plunger, and mechanism for-reciprocatingsaid blank holder with a dwell in its movement, said mechanismcomprising a slide member guided to slide from front to rear of thepress, a rock member, connection from said'rock member to said slidemember, and connection from said rock member to said crank-shaft,'saidseveral connections each providing for a dwell of the slide member, andmeans connected with opposite ends of said slide for transmitting motiontherefrom to the blank holder.

71A drawing press having a frame, a plunger, and a blank holder, andmechanism for reciprocating said blank holder with a dwell in itsmovement, said mechanism comprising a slide member, means for actuatingsaid slide member, and means connected with the slide for transmittingmotion therefrom to the the blank holder, said dwell in its movement,said mechanism comprising a slide member, means for actuating said slidemember, and, means connected with the slide for transmitting motiontherefrom to the blank holder, one of said means having an elementdistinct from the slide mem ber itself which is guided in its movementsby said other means.

9. A drawing press having a frame, a

plunger, and a blank holder, and mechanism for reciprocating said-blankholder with a dwell in its movement, said mechanism comprising a slidemember, means for actuating said slide member, a rock shaft connectedwith the slide member, a linkage for actuatin said rock shaft from'theslide member sald linkage including a rock lever carried by said rockshaft, and means for actuating said slide member, said last-mentionedmeans having a movable element which is guided in its movement by saidlinkage.

10. A drawing press having a frame, a plunger, and a blank holder, andmechanism for actuating said blank holder with a dwell in its movement,said mechanism comprising a slide member guided to slide in a direct-ionfrom front to rear of the press, means connected with said slide memberfor transmitting motion therefrom to the blank holder, and meansconnected at the rear end of said slide for actuating the same.

11. A drawing press comprising a frame, a plunger, a crank-shaftoperably connected to said plunger, a blank holder, a pair of rockshafts for actuating said blank holder, and mechanism for actuating saidrock shafts to move said blank holder comprising a slide member providedat a medial point of the frame, connections from said slide member toeach of said rock shafts, said connections having a similar number ofoperating parts to provide for equal operation of the rock shafts, arock part, operating connections from said rock part to said slidemember and to a medial portion of said crank-shaft, said last namedoperating connections each including an arm distinct from the slidemember the crankshaft and the rock part connected to provide for asubstantial dwell in the movement of the silde member and of the rockshafts.

12. A drawing press comprising a frame, a plunger, a crank-shaftoperably connected to said plunger, a blank holder, a pair of rockshafts for actuating said blank holder lying parallel to thecrank-shaft, and mechanism for actuating said rock shafts in oppositedirections to move said blank holder comprising a slide member providedat a point centrally of the ends of the frame, connections from saidslide member to intermediate parts of each of said rock shafts, a rockpart operating connections distinct from the rock part the slide memberand the crank-shaft, from said rock part to said slide member and to thecentral 'portion of said crank-shaft, said last named operatingconnections each providing for a substantial dwell in the movement ofthe slide member.

13. A drawing press comprising a frame. a plunger, a crank-shaft foroperating said plunger, a blank holder, a pair of rock shafts, toggleconnections from said rock shafts to said blank holder, and mechanismfor actuating said rock shafts in opposite directions to move said blankholder comprising a slide member guided to reciprocate in a directioninclined to the direction of movement of said blank holder, connectionsfrom said slide member to each of said rock shafts, an actuating part,connections from said actuating part to said slide member and to amedial portion of said crank-shaft, said last named connections eachincluding arms connected to provide for a substantial dwell in'themovement of the slide member and rock shafts.

14:. A drawing press, comprising a frame, a plunger, a crank-shaft foroperating said plunger, a blank holder, a pair of rock shafts parallelto said crank-shaft, toggle connections from said rock shafts to saidblank holder, and mechanism for actuating said rock shaftssimultaneously and equally in opposite directions, comprising a slidemember guided for reciprocatory movement at an angle to the direct-ionof movement of the blank holder at a point centrally between the ends ofthe frame, connections from said slide member to intermediate parts ofeach of said rock shafts, said connections having a similar number ofoperating parts, a plurality of rock parts mounted intermediate the endsof the frame on axes fixed in said frame, and intercom nections betweena rock part and the slide member, between the other rock part and amedial portion of the crank-shaft, and be tween said rock parts, eachproviding for a dwell in the movement of the slide member.

l5. A drawing press comprising a frame. a plunger, a crank-shaft foroperating said plunger, a blank holder, a pair of rock shafts foractuating said blank holder, and mechanism for actuating said rockshafts in opposite directions, comprising a movable member locatedintermediate the ends of the frame, connections from said movable memberto intermediate parts of each of said rock shafts, a rock part mountedon an axis fixed at the rear of the press at a central portion thereofand rearwardly offset from the crank-shaft axis, connections from saidrock part to said movable member and to an intermediate portion of saidcrank-shaft, said last named connections each including membersconnected to provide for substantial dwell in the movement of themovable member and of the rock shafts.

In testimony whereof I hereto affix my signature.

ARTHUR A. BYERLEIN.

